Toyota RAV4 manuals

Toyota Sienna Service Manual: Occupant Classification ECU Malfunction

DTC B1795 Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.

Troubleshoot DTC B1771 first when the DTCs B1771 and B1795 are output simultaneously.

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DTC

  1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
  2. Check the DTCs.

    Result:
    A: DTC B1795 is output.
    B: DTCs B1771 and B1795 are output.

HINT: Codes other than DTC B1771 and B1795 may be output at this time, but they are not related to this check.

2 CHECK FUSE

  1. Measure the resistance of the ECU-B fuse.

Resistance: Below 1 Ω

3 CHECK WIRE HARNESS (SOURCE VOLTAGE)

CHECK WIRE HARNESS (SOURCE VOLTAGE)

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds
  3.  Disconnect the connector from the occupant classification ECU.
  4.  Connect the negative (-) terminal cable to the battery.
  5.  Turn the ignition switch to the ON position.
  6.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

  1. Turn the ignition switch to the LOCK position.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

4 REPLACE OCCUPANT CLASSIFICATION ECU

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the occupant classification ECU

5 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2. Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration".

OK: "COMPLETED" is displayed.

6 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

END

Open in Occupant Classification ECU Battery Positive Line
DTC B1794 Open in Occupant Classification ECU Battery Positive Line DESCRIPTION This circuit consists of the occupant classification ECU and the power source circuit (battery, fuse, wire harness ...

Sleep Operation Failure of Occupant Classification ECU
DTC B1796 Sleep Operation Failure of Occupant Classification ECU DESCRIPTION During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is of ...

Other materials:

Fuel pump resistor
Components REMOVAL 1. REMOVE FUEL PUMP RESISTOR (a) Disconnect the connector. (b) Remove the nut and fuel pump resistor. INSPECTION 1. INSPECT FUEL PUMP RESISTOR (a) Inspect fuel pump resistor. (1) Using an ohmmeter, measure the resistance between the terminals. Standard resi ...

Wiper switch
COMPONENTS REMOVAL 1. REMOVE STEERING COLUMN COVER 2. REMOVE WINDSHIELD WIPER SWITCH ASSEMBLY  Disconnect the connector.  Using a screwdriver, disengage the claw and pull out the windshield wiper switch assembly. NOTICE: The claw will be broken if pressed hard. HINT ...

Definition of terms
Term Definition Monitor description Description of what the ecm monitors and how it detects malfunctions (monitoring purpose and its details). Related dtcs Diagnostic codeV Typical enabling condition Preconditions that allow the ecm to detect malfunc ...

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